计算,能简算的要简算: 1234+700+300 26+(89+74) 48×25 85×199+85 69×27+27

1个回答

  • 解题思路:(1)运用加法结合律简算;

    (2)运用加法交换律简算;

    (3)先把48分解成12×4,再运用乘法结合律简算;

    (4)(5)运用乘法分配律简算;

    (6)根据除法的性质简算.

    (1)1234+700+300,

    =1234+(700+300),

    =1234+1000,

    =2234;

    (2)26+(89+74),

    =26+74+89,

    =100+89,

    =189;

    (3)48×25,

    =12×4×25,

    =12×(4×25),

    =12×100,

    =1200;

    (4)85×199+85,

    =85×(199+1),

    =85×200,

    =17000;

    (5)69×27+27×31,

    =(69+31)×27,

    =100×27,

    =2700;

    (6)700÷4÷25,

    =700÷(4×25),

    =700÷100,

    =7.

    点评:

    本题考点: 整数四则混合运算;运算定律与简便运算.

    考点点评: 完成本题要注意分析式中数据,运用合适的简便方法计算.